roundabout

A small patchable synthesizer.

Tech details:

uses jumper wires and pin headers for patching
CMOS-based circuitry
3 oscillators with sync and weighted CV inputs
2 goofy state-variable filters
2 frequency dividers
2 4-bit shift registers
4-bit R2R DAC
2 mults and an extra buffer
left and right mixers with weighted inputs
stereo output suitable for headphones
powered by a 9v battery (rechargeable NiMH recommended)

Manual:

https://github.com/MattKuebrich/roundabout/wiki

BOM:

https://docs.google.com/spreadsheets/d/1eRZ8_PK5HJ3nKBCjX_7MApqO0d7YXJZ0Co2NMGjRWOA/ (Use this when sourcing parts)
https://mattkuebrich.com/roundabout/ibom/ (iBOM)

Discussion:

https://llllllll.co/t/roundabout/

Videos:

"rungler" style patch
roundabout patches
roundabout battery drain shred sesh
roundabout (diy chaotic noisemaker) via faux cyrillic
more roundabout via faux cyrillic
rack mounted roundabout adaptation for AE Modular via faux cyrillic
roundabout + reverb/delay/EQ from Bluebox via Keurslager Kurt